Automatic telephone system



y 1927' J. E. GARDNER AUTOMATIC TELEPHONE SYS TEM Original Filed June 23. 1922 5' Shets-Sheet l '-I'L"LUETL 02- Jnhn BEBE/her art- , 1,626 807 May J. E. GARDNER AUTOMATI C TELEPHONE SYSTEM Original Flled June 25. 1922 5 Sheets-Sheet 2 Q Q R1 9| nub n25 Juhn E Earcfnar may 3,1921.- 1.626.801.

J. E. GARDNER I AUTOMATIC TELEPHONE SYSTEM.

Original Filed June 23. 1922 s Sheets-Sheet :s

May a, 1927. 1,626,807

1. E. GAR1"JNER AUTOMATIC TELEPHONE SYSTEM O ig al Filed June 2:5. 1922 5 Sheets-Sheet 4 May 3, 1927; 1,626,807

J. E. GARDNER AUTOMATIC TELEPHONE SYSTEM Original Filed June 23. 1922 5-Sheets-Sheet 5 Patented May 3, 1927.

r UNITED STATES PATENT OFFICE.

JOHN E. GARDNER, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MEsNE ASSIGNMENTS, TO

AUTOMATIC ELECTRIC INC, OF CHICAGO, ILLINOIS, A CORPORATION OF DELA- WARE.

AUTOMATIC TELEPHONE SYSTEM.

Application filed .Tune 23, 1922, Serial No. 570,494. Renewed September. 24, 1926.

The present invention relates in general to automatic telephone systems, but is more particularly concerned with methods of handling long distance calls in such systems; and the general object. of the invention is to provide a new and improved toll service trunking system for connecting local subscribers in automatic exchanges with long distance lines either as calling or called subscribers. v

More specifically, the invention is concerned with a. toll service trunking system containing improved circuit arrangements whereby the toll op rators can connect with desired calling or called automatic lines which are equipped with paystations, and whereby such operator-scan thereafter collect or refund deposited coins as the occasion requires.

A special object of the invention is the provision of novel mechanism and circuit arrangements whereby the subscriber is antomatically notified of the required amount of toll and whereby it is unnecessary for the toll operator after notifying the subscriber of the required amountof toll, to supervise the depositing of coins. Mechanism is provided by which the toll operator may complete the established connection and need pay no further attention to it unless'it is necessary for her to give it special attention. However, the subscribers are not connected together until the proper amount of .toll is deposited at the paystation apparatus, whereupon the connection is completed and the toll operator is notified that the correct amount has been placed in the coin box.

In addition to the above, there are a numher of other improvements not now specifically mentioned which together with the :l'oregoing will be explained hereinafter with reference to the accompanying drawings.

Referring to the drawings, comprising l igs. 18, inclusive, Figs. 1-5, inclusive, show by means of the usual circuit diagrams the apparatus required to establish a complete connection from a. toll line terminating in the jack J, Fig. 1, to a local subscribers station A, Fig. 5. This apparatus comprises the cord circuit 0, Fig. 1, located at the toll operators position in a. toll switching station or oiiice; the two conductor trunk line extending from jack J in'the toll switch- Iiic'e thrriuigh the relay group D, this re cup being provided for controlling the coin collecting and other circuits under certain conditions, to the transmission repeater B, Fig. 2, in themain exchange of the system: the toll first selector 1E, and a toll second selector 2E, Fig. 3; and the toll rotary connector H, Fig. 4-. The repeater, first selector, second selector and connector mentioned are all in the same cities or exchange, which. as indicated above may be one of the main oflices or exchanges of a large multi-otlice system.

Fig. 6 shows certain connections of the test contacts in a certain level of the connector H which are necessary in order to enable this connector to give rotary service, the test contacts of the fourth to the seventh contacts,

inclusive, being those associated with a group of lines. When it is desired to connect with a line in this group the connector H will be operated until its wipers are brought into connection with the first set of contacts. Should the line associated with the first set of contacts in the group be busy the connector will be automatically operated until connection is made with an idle line in the group. If all the lines in the group are busy the connector will not operate but will maintain itself associated with the first set of bank contacts, transmitting a busy signal to the calling party, and as soon as one of the grouped lines become idle the connector will then operate to select it.

Fig. 7 shows a certain type of calling device which is associated with the trunk lines leading out from the operators position and which control certain toll assessing circuits as will be explained.

Fig. 8 shows a detail view of the dial of the registering device, the mechanism of which is indicated in Fig. 5, associated with the subscribe1"s paystation apparatus, which is used for indicating to the subscriber the required amount to be deposited.

As has been indicated hereinbefore, a fea ture of the invention is the provision of suitable arrangements whereby the toll operator can collect or retundcoins deposited to pay for a toll connection, and it should be explained that the subscribers stations, or some of them at'least, are provided with coin collecting devices, or pa stations, of the well known type which is escribed in the. U. S. patent to Forsberg, No. 1,043,219. Paystation equipment of this type is shown diagramina connection with. the

substation A, Fig. 5. \Vhile the paystation coin collecting and refunding mechanism is substantially the same as shown in the above cited patent, certain additions have been made whereby the operator is enabled to visually indicate to the subscriber the amount to be deposited and does nothave to supervise the depositing of coins. The additions to the paystation mechanism con1- prises a rotatable shaft 416 attached to the ratchet wheel 423. The shaft 416 is movable rotatably and longitudinally and rests on suitable bearings, one of these being shown at 425. At the upper end the shaft 416 provided with an armature 433 which 18 controlled by the magnet 410. The ratchet wheel 423 is adapted to be rotated by the operating magnet 413 through the medium oi the pawl 414 against the .tension of the spring 424. As soon as the shaft leaves the 05 normal position the cam 421 thereon allows the spring 417 to engage its working contact. The shaft and ratchet wheel are restored to normal either by the operation of the escapement, which is operated by the magnet 410, or by the operation of the magnet 419. It the magnet 419 is operated the ratchet wheel 423 is pulled out of engagement with the escapement and operating mechanism and restores to normal under the influence of spring 424. When the magnet 419 is deenergized, the spring 424 causes the shaft 416 carrying the ratchet wheel to revert to its normal position in proper relation to the operating and escapementmechanism.

In Fig. 8, there is shown diagrammatically a view of the registering mechanism for indicating to the subscriber the amount to be deposited. This comprises a dial. 450 upon which is printed various amounts. The indicating mechanism proper consists of a pointer 435 which is controlled by the shail t 416. The shaft 416 by means of the gear wheels 137. 438. and 439 controls the dollars pointer 436. The pointer 436 moves one space for each revolution of the pointer 435. Thus by operation; the ratchet wheel 423 the subscriber may be apprised of the amount to deposit in his coin box. It will be noted that the shaft 416. upon advai'lcing; one step under influence of the stepping magnet 413, does not cause the indicator pointer 435 to move due to the fact that there is a slot cut in the gear wheel 437. hen the shaft 416 advances one step the projection or boss 451 on the shaft 'lalls behind the dog 452 so that when the sha it starts to return to normal the pointer move back also. l'Vhen the magnet 419 is operated it will be recalled that it also withdraws the ratchet wheel from the es capement mechanism. This operation also withdraws the boss 451 from position behind the dog 452. hen the magnet- 419 is deenergized the shaft 416 assumes its normal position in regard to the pointer 435. The above provision: are made so as to compensate tor a preliminary step which the ratchet 423 receives as will appear later.

In so far as the measured service 'l'caturcs of the present case is concerned it may be considered as an improven'ient on the sys tem shown in the two prior applications of Wicks Serial Nos. 379.217, and 482,765, tiled on May (5, 1920, and July 6, 1921, respectively. In regard to certain features 01" the toll trunking system, the present system is closely related to the system disclosed in the last mentioned application.

It should be noted that relays which are. quick to pull up but slow to release are so indicated on the drawings by showing the copper slug cross hatched, whereas relays which are both slow to pull up and slow to release are so indicated by showing the slug; in solid black.

111 view of the fact that Strowger switch mechanism is employed. the general character of which is well understood, and also because of the descriptions in the applications above reterred to, from which the general purpose of the invention will be easily appreciated, it will be unnecessary to consider in detail the various switches and other parts of the equipment, and the explanation ot the operation of the complete system will at once he proceeded with.

in order to describe the operation of the invention it will be assumed that the subscriber at substation A desires to obtain a toll connection, and it will be assumed "further that the subscriber has placed the call with the toll recording operator, and that the ticket containing the usual data corcerningthe desired connection has been forwarded to the toll operator having the cord circuit 0, Fig. 1, for completion.

l'l avin c, extended the connection to the desired distant exchange over one oi her toll lines, such for example as the toll line which terminates in the jack J, Tile. 1, and havinp; ordered the proper local line to be connected up in thatcxchangc, the toll (mcrator wiil next. proceeiil to call th, subscriber at sub station A by ay oi the toll service trunhing system. Observing' that the toll trunl; tern'iinatino' in jack J is idle, as indicated by the unlighteifl condition of the lamp if. the operator will insert the calling plug P of the cord circuit 0 into the jack .1; the calling device key K being thrown short after. Upon the insertion of the plug; l into the jack J, a circuit is completed to:- the sleeve relay 50 o't' the trunk circuit in series with the sleeve relay 14 in the cord circuit 0. Relay 50. upon energizing. at its armature 53 closes a circuit tor the relay 71. The operation of armature 78 on relay 50 merely opens a point in a certain supervisory controlling circuit as will appear til) later. Relay 71, upon operating, at armature 74; establishes a locking circuit for it self, at armature 73 closes a point in the said supervisory controlling circuit, and at arma ture closes a circuit for the lamp L and its multiples whereby the toll operators are informed that the associated trunk line now inusc. The operation of relay 14: in the cord circuit is without function for the present. Another result of: the insertion (it the plug 1 into the jack J that a bridge is closed across trunk conductors and 91 whereby a circuit is completed for the line relay 160 of the toll first selector 1E, Fig. 3, in the main exchange. This circuit may be traced from battery through the upper winding of line relay 160, armature 17 5 and its back contact, conductor 157, normally closed springs controlled by armature 126, normally closed springs controlled by armature 181, upper left hand winding of the repeating coil, trunk conductor 90, armature 60 audits back contact, ring of jack 'J, ring of plug 1 spring 26 on key K and its resting contact, springs 27 oi? key K through the winding 01'. polarized relay 15, springs 28 on key K resting contact and spring 25 of key K tip of plug P, tip of jack J, back contact and armature 63, trunk conductor 91, lower left hand winding of the repeating coil of the repeater R, to ground by way of normally closed springs controlled by armature 133. The line relay 160 of the toll first selector 1E, Fig. 3, is energized over this circuit and, upon operating, completes the circuit of the slow acting relay 161. The latter relay, upon energizing, prepares the impulsing circuit of the first selectori 1E in the usual manner. When the calling device key K in the cord circuit 0, Fig. 1, is operated", the impulse springs of thecalling device S are substituted for the winding of the polarized relay 15 in the cord circuit.

The toll operator will now operate her calling device S in accordance with the telephone number of the subscriber at substation A. WVhen the calling device dial is operated in accordance with the first digit oil the desired number, a series of interruptions is produced in the circuit Oil" the line relay 160 ()l the first selector 1E. The line relay 160 deenergizes a plurality of times in response to theseinterruptions, each time extending an impulse of current to the vertical magnet 182 in series with the slow acting relay 163. Magnet 182 operates to raise the switch shalt carrying the switch wipers 187190, inclusive, step by step until the said wipers are brought opposite the level of bank contacts corresponding to the number of interruptions in the digit dialled. The slow acting relay 163 is ener gized'in series with the vertical magnet, maintains its armature attracted throughout the vertical movement of the switch and, upon the hrst vertical movement of the switch shaft, when the oil normal springs are shifted, complctesa circuitior the stepping relay .165 at its armature 17 Uponenergizing,

relay 165, at armature 179, establishes a' locking circuit for itself, and at armature 178 prepares a circuit for the rotary ma net 181.

Another result of the shifting 01: the on,

normal springs is that ground is placed upon the conductor 156 which extends by way of the resistance 147 through a winding of the polarized relay 105. The polarized relay 105 is not operated over this circuit for the V 7 reason that its polarizing winding is of high resistant-sand it'ew turns, and does not generate sutlicieut flux to cause the armatures to be attracted. Shortly after the termination of the vertical movement of the set of bank contactsgis busy, there will be a ground potential upon the test contact engaged by the test wlper 189, and the stepping relay 165 will be again energized. Upon operating, relay 165 establishes a locking circuit for itself at armature 179, and at armaturev 178 closes the circuit of the rotary magnet 181. The rotary magnet 181 rotates the switch shaft bringing the wipers into engagement with the next set of bank contacts on the level selected and, at its armature 177 opens the circuit of the stepping relayf165, which deenergizes, opening the circuit of the rotary magnet, which deenergizes also. The stepping operation 01 the firs selector 1E continues under control of the stepping relay 165 and the rotary magnet 181 until the switch wipers are brought into engagement with a set of bank contacts associated with an idle trunk line, which, we will assume, are the bank contacts 191-194, inclusive. In this case there will be no groiuul potential. upon the test contact 193 engaged by test wiper 189 and no circuit will be completed tor the stepping rela 165. The rotary operation of this switch now CHISGS and the switching relay 162 which has been short circuitcd during the preceding operation of the selector 1E is energized in series with the stepping relay 165. Relay 162, upon, operating, at armature 172 alaces round 11 on the test contact 193 in order to busy the seized trunk line, at armature 1'21 closes a point in a ringing control circuit, which will be described, at armature 173 opens a point in the circuit of the vertical magnet 182 and at armatures selector 2E.

and extends the connection to the second The line relay 195 of the second selector 2E is immediately energized over a circuit extending from battery, through the upper winding of relay 195, by way of back contact and armature 219, bank contact 191, wiper 187, armature 170 and its front contact. front contact and armature 166, conductor 154, armature 14 1 and its back contact, armature 135 and its back contact, armature 140 and its back contact, normally closed springs controlled by armature 115, upper right hand winding of the repeating coil of the repeater R, armature 129 and its back contact, through the lower winding of the electro-polarized relay 105, lower right hand winding of the repeating coil, back contact and armature 117, back contact and armature 1 13, back contact and armature 139, back contact and armature 1416, over conductor 159, front contact and armature 180, wiper 190, bank contact 194:, armature 228 and its back contact, through the lower winding of the relay 195 of the second selector 2E to ground. Relay 195 is immediately energized over this circuit and, upon operating, closes the circuit of the slow acting relay 196. The latter relay energizes to prepare the circuits of the selector 2E for operation, and also places ground upon the release trunk conductor 229. It will be noted that the release trunk conductor 229 has ground placed upon it by the slow acting release relay 161 in the first selector 1E. It will also be noted that the switching relay 162 of the selector 1E, upon energizing, did not open the circuit of the line relay 160, and therefore this relay remains under the control of the impulse springs of the calling device S, it being remembered that the previously traced circuit of the line relay 195 includes the impulsing contact 166 on the line relay 160 of the selector 1E.

It will now be apparent how the second selector 2E is controlled. When the toll operator operates her calling device in ac cordance with the next digit of the desired number, a series of interruptions is produced in the circuit of the line relay 160 of the selector repeater 1E and, by the deenergizations of this relay, this impulse series is repeateil to the line relay 195 of the second selector 2E. The line relay 195 of the second selector operates to control the vertical magnet of this switch in stepping the switch shaft carrying the wipers to the proper level of bank ciiintiwts whereupon the trunk hunting operation of the selector ensues and continues until the switch wipers are brought into engagei'nent with a bank contact set asr-; ciated with an idle trunk line. It will be assumed. that the trunk line terminating in bank contacts 201-20 1, inclusive, is the first one found to be idle. Now, when the switch wipers 197200, inclusive, are brought into engagement with this set ofvbank contacts, the switching relay 215 which has hitherto been short circuited will be energized to disconnect the line relay 195 and to extend the connection. by way of wipers 197 and 200, bank contacts 201 and 204, trunk conductors 205 and 203, by way of normally closed springs cmltrolled by armaturcs 329 and 3341:, armatures 324 and 328, to the upper and lower windings of relay 301 of the toll rotary connector H, Fig. 4.

The relay 301. immediately energizes upon the extension of the connection as described, and operates, at its armature 322 to open a point in the circuit of relay 302, and at armature 321 closes the circuit of the slow acting relay 300. Upon energizing, relay 300 opens the circuit of the release magnet at armature 317, prepares the circuit of the connector H at the front contact of this armature, and at armature 316 completes a circuit for the upper winding of relay 30 1. The latter relay, upon operating, at armature 336 establishes a locking circuit for itself which may be traced from ground at the transmission repeater R by way of armature 115 and its back contact, ringing control conductor 155, front contact and armature 171, wiper 188, bank contact 192, armature 217 and its front contact, wiper 198, bank contact 202, conductor 206, front contact and armature 336, and through the Winding of relay 30 1 to battery. Another result of the energization of the relay 304 is that the ringing circuit, which would normally be operative immediately upon the connector H connecting with the called line, is opened, and by means of the previously traced locking circuit, is placed under the control of the toll operator.

The toll operator may now operate her calling device in accordance with the next digit in the desired number. This operation produces a series of interruptions in the circuit of the line relay 160 of the selector 1E and by the successive energizations of this relay these impulses are repeated to the line relay 301 of the connector H. Relay 301, on deenergizing in response to these interruptions, sends a plurality of impulses to the vertical magnet 311. The circuit over which the lirat of these llllijil'ilHGf-i is sent may be traced from ground by way of back contact and armature 327, armature 321 and its back contact, arn'iaturc 317 and its front coi'itact, oif normal springs 313 and 320, through the winding of the vertical magnet 311, and through the winding of the slow acting relay 306 to battery. Upon the first vertical stop of the switch shaft, the off normal springs are shifted and the remaining impulses to the magnet are transmitted over a circuit which is similar to the one above traced except that it includes the off normal springs 318 and 319 and armature 341 on contact the slow acting relay, 306, which is now energized. erates to raise the switch shaft carrying the switch wipers 360363, inclusive, step by stop until these wipers are brought opposite the level of bank contacts corresponding to the number of interruptions in the digit dialled. The slo acting relay 306 is energized in series with the vertical magnet and, as indicated before, operates to maintain the vertical magnet circuit closed deenergization of the latter relay, the rotary n'iagnet 310 is actuated over the following circuit: ground by way of back contact and armature 327, arn'iature 321 and its back contact, armature 317 and its front contact, 01f normal springs 318 and 319, armature 341 and its back contact, back contact and armature 345, through the winding of slow acting low resistance relay 308, armature 332 and its back contact, and through the winding of the rotary magnet 310 to battery. Magnet 310 operates to rotate the switch wipers 360-363, inclusive, step by step until they are placed into engagement with the bank contact set associated with the line of the substation A, which, we will assume, are the bank contacts 390-393, inclusive. The slow acting relay 308 is energized in series with the rotary magnet, at its armature 349 connects the test wiper 362 to the winding of the test relay 307, at armature 348 opens a point in the automatic rotary circuit which will be described, and at armat'ure 350 short circuits the contact springs comprising armature 345 and its backcontact on the test relay 307 so as to prevent the rotary magnet circuit being prematurely opened when the switch wipers are rotated over bank contact sets associated with busy lines.

Assuming that the desired line is idle at the present time, there will be no ground potential present upon the test contact 392 and no circuit will be completed for the test ielay 307. Then, following the deenergizalion of the slow acting relay 308, a circuit may be traced extending from ground by way of front contact and armature 315, back contact and armature 343, through the lower winding of the switching relay 303, back contact and armature 349, test wiper 362, test 392 orivate normal conductor 395 The vertical magnet 311 op-' through the winding of the switching relay:

400 of the line switch C, and thence through the winding of the rotary magnet 402 to battery. The switching relays 303 and 400 are energized over this circuit. However, due to a mechanical locking device controlled by the armature of the line relay 401, which is now normal, the switching relay 400 only partially attracts its armatures enough to disconnect the line of the substation A from its normal battery and ground connections in the line switch C. Relay 303, upon energizing, at armature 331 establishes a locking circuit for itself, at armature 332 opens the circuit of the rotary magnet 310, at armature 333 prepares a circuit for relay 302, and atarmatures 329 and 334 reverses the connections of the windings of the line relay 301 with regard to the trunk conductors 205 and 208 whereby the current flow over these conductors is reversed. This current reversal brings about the energization of. the

armature 130 by short circuiting the resistance 147, at armatures 129 and 132 disconnects itsown lower winding from the trunk conductors 154 and 159 and connects the windings'of the battery feed relay 104 thereto, at armature. 131 places the alternating current relay 106 in bridge of the incoming trunk conductors 90 and 91. Theoperation of armature131 also connects the high resistance 40,000 ohm relay 102 from the conductor 90 to ground. In addition, the operation of armatures 131 and 133 connects the line relay 160 of the selector 1E to the conductors 90 and 91 ofthe incoming trunk line in such a manner that the current flow over these conductors is reversed. Assuming that the operator has restored the calling device key K to normal, as ordinarily will be the case, the polarized relay 15 in the operators cord circuit will be operated whereby a cirgu it is completed for the supervisory lamp J o operator is notified that the been completed.

Returning now to the operation of the electro-p0larized relay'105 in the repeater connection has By the operation of this signal the R, another result of its energization is that the circuit of the line relay 301 of the con battery through the upper Winding of the line relay 301; hence relay 301 Will deenergize. The line relay 301, upon deenergizing, at armature 321 opens the circuit of the slow acting relay 300, at the back contact of this armature closes a point in the circuit of the release magnet and at armature 322 closes a circuit for the relay 302. The latter relay, upon operating, at armature 327 opens a point in the circuit of the release magnet, and at armatures 324 and 328 disconnects the windings of line relay 301 from the trunk conductors 205 and 208 thereby providing a direct metallic circuit from the repeating coil in the transmission repeater R to the called line, at armature 326 opens the original energizing circuit of ring out off relay 304, and at armature 325 opens a point in the circuit of the test relay 307.

The next operation is to ring the sub scriber at substation A. For this purpose the toll operator momentarily operates her ringing key K thereby projectingringing current from the generator Gen. out on the trunk line comprising conductors and 91 which operates the alternating relay 106 in the repeater R over a circuit extending from the free pole of the generator Gen.

by way of resting contact of spring 30 of key K and the said spring, resting contact of spring 31 of key K and the said spring, working contact of spring 26 of key K and the said spring, ring of plug P, ring of jack J", back contact and armature 60, trunk conductor 90, upper left hand winding of the repeating coil, springs 149, through the winding of the alternating relay 106, condenser 148, lower left hand winding of the repeating coil, trunk conductor 91, armature 63 and its back contact, tip of jack J, tip of plug P, spring 25 of key K and its working contact to ground. A second path over Which this ringing current flows extends through the winding of the high resistance relay 102 to ground by Way of armature 125 and its back contact, and a third path extends by Way of armatures 131 and 136, through the resistance 150, back contact and armature 123, conductor 158, and through the lower Winding of relay 160 of the first selector 1E to ground. The relay 102 is of very high resistance and will not be operated by this ringing current. The alternating current flowing through the lower wind ing of the line relay 160 of the first selector E has no effect on it as a circuit for its upper winding is completed from ground at the working contact of spring 25 of key K in the cord circuit O. The alternating current relay 106 is operated over the previously traced ringing circuit and, upon attracting its armature 13 1;, completes the circuit of the relay 100. Relay 100, upon energizing, removes ground from the ringing control conductor 155 at armature 115. This operation opens the locking circuit of the ring cut off relay 30 1 in the connector H. The operation of armatures 116 and 117 on the relay is without function in the present instance. The relay 304, upon deenergizing, completes the ringing circuit of the called subscriber. The subscriber at substation A will now be intermittently signalled until he responds. lVhen the receiver is removed at the called substation the ring out off relay set is energized over the called subscribers line loop and, upon ope 'ating, reestablishes its former locking circuit to ground on the ringing control conductor 155 at armature 336, the operator having restored her ringing key by this time to permit the deenergization of the relay 100. Relay 3041- also opens at armatures 335 and 338 the ringing circuit of the called substation and at the front contacts of these arniatures finally completes the talking connection. Talking battery is now supplied to the transmitter at substation A from the windings of the battery feed relay 104C in .the transmission repeater B. This circuit Will not be traced in detail but it will be observed that the lower conductor 208 extends uninterruptedly back through the connector H, selectors 2E and 1E, to the lower right hand Winding of the repeating coil in the transmission repeater from whence it extends through the lower Winding of the battery feed relay 104 to battery, while the upper conductor 205 and extends back through the connector H, selectors 2E and 1E, through the upper right hand winding of the repeating coil from which point it may be traced through the said Winding and through the upper winding of the battery feed relay 104C to ground. The relay 10 1 is energized by the current flow over the called line loop and, upon attracting its armature 128, closes a circuit for the slow acting relay 103, and at armature 127 prepares a certain signalling circuit which will be described subsequently. Relay 103, upon operating, places an additional ground upon the ringing control conductor Another result of the energization of relay 103 is that the high resistance relay 102 is placed in bridge of the trunk conductors 90 and'91 at armature 125. This bridge may be traced from trunk conductor 90, upper left hand winding of the repeating coil, front contact and armature 131, through the winding of high resistance relay 102, armature 125 and its front contact, resistance 151, armature 133 and its front contact, lower left hand Winding of the repeating coil to trunk conductor 91. A further result of the energization of the relay 103 is that the line relay 160 of the selector 1E is disconnected from the trunk conductors 90 and 91 and a local circuit is completed for it, which extends from ground, through the lower winding of the relay 160, conductor 158, resistance 152, armature 126 and its front contact, conductor157, back contact and armature 175, and thence through the upper winding of the relay 160 to battery. The relay 103 also at its armature 124 and its front contacts prepares a certain simplex circuit by short circuiting the condenser 153 in the left hand windings of the repeating coil and by connecting the inside terminals of these windings through the resist ances 92 and 93, respectively, and through the winding of the relay109 to ground. However, relay 109 is not energized at this time as the simplex circuit including trunk conductors 90 and 91 in parallel is notyet completed. As the line relay 160 is disconnected from the trunk conductors 90 and 91, no battery will be present thereon and the polarized relay in the operators cord circuit will deenergize to eiface thevsupervisory lamp L.

The operator will now come in on the line by throwing her listening key K and, after observing that the proper party is at the telephone, willnotity him to deposit in the paystation mechanism the amount which will be indicated. The operator will now momentarily operate the key K associated with trunk circuit D. By this operation a circuit is completed for the relay 54. Upon operating, this relay at armature 01 pres pares a locking circuit for itself, at armatures and 63 disconnects the trunk conductors 90 and 91 from the ring and tip sides of the jack J, respectively, and at the front contacts of these armatures completes a simplex circuit by connecting the two trunk conductors 90 and 91 together through the springs of the calling device S, and the slow acting low resistance relay 51 to battery.-

This operation places battery through the relay 51 upon the two trunkconductors 90 and 91 in parallel. whereupon a circuit is completed extending over the said trunk conductors, through the left hand windings of the repeating coil in the repeater R by way of armatures 118 and 120, through the resistances 92 and 93, by way of armature 124 and its front contacts, and through the winding of the repeating relay 109 to ground. Relays 51 and 109 in the trunk circuit D and repeater 1%, respectively, are energized. Upon operating, relay 51, at armature 57 establishes a locking circuit for the relay 54 and at armature 58 places the winding of relay 52 in series with the sleeve relay 50. The latter operation causes the relay 14 in the cord circuit 0 to deenergize, opening the conductors of the cord circuit at armatures 22 and 21. In the repeater R, the re peating relay 109, upon operating, at armature 145 establishes a circuit for the slow to operate relay 101, at arniatures 144 and 146 disconnects thetrunk conductors 154 and 159 from the right hand windings oi the repeating'coil, and connects these conductors through the winding or" the lov re sistance slow releasing relay 108 to the high voltage battery B These operations also close another simplex circuit which may be traced from the ungrounded pole of the high voltage battery B through the winding of relay 108 over the trunk conductors 154 and 159 in parallel, armatures 170 and 180, wipers 187 and 190, bank contacts 191 and 194, armatures 219 and 228, wipers 197 and 200, bank contacts 201 and 204, trunk con ductors 205 and 208, armatures 338 and 335,

'armatures 334 and 329, armatures 328 and 324, wipers 363 and 360, bank contacts 393 and 390, conductors396 and 394, switchhook springs 500 and calling device springs 501, through the windings of the bell coils,

by the ordinary exchange battery voltage so that it will not be operated when the subscriber calls by battery, through the line relays of the automatic switches. Relay 108, upon energizing, at armature 142 opens the circuit of the slow to operate relay 101 before it has had time to'operate, and at armature 141 establishes another circuit for the slow acting relay 103. An additional result of the energization of relay 108 is that the talking conductors extending back to the right hand winding of the repeating coil are openedat another point. The disconnecting ot trinil: conductors 154 and 159 from the right handwindings oi the repeating coil causes the battery feed relay 104 to deener gize and open the circuit of the slow acting relay 103. However, the relay 103 does not deenergize at this time as the slow releasing relay 108 energizes immediately after the 'energization of relay 1.09.

The operator may now actuate the calling device S in order to set up the required toll charge. Assuming that the charge is 15 cents, the operator will actuate the dial of the S by placing her linger in the hole marked 15 and acti'lating the calling device in the usualmanner. By these operations, three interruptions are PlOtlllCt-Xl in the circuitoi' the repeating relay 109 in the transmission repeater R, and also in the circuit of the slow acting relay 51 of the trunk circuit D. The slow acting relay 51 main-- tains its armatures attract-ed throughout the impulse series. Relay 109 deenergizes three times in response to these interruptions thereby producing three interruptions in the circuit of the stepping magnet 413 in the paystation mechanism at the substation A. Magnet 413 deenergizes three times to advance the ratchet wheel 4L3 three more steps. It will be noted that the stepping magnet 413 always takes one additional step to the number of interruptions produced in its circuit for the reason that when its circuit. is closed originally, it takes one step. The manner in which this preliminary step is conujiensated for has already been described. Upon the second step of n'lagnet 413 the cam 421 on the shaft 416 allows the spring 41. to engage its working con tact thereby placing the coil 434 in multiple with the stepping magnet 413. This latter operation controls the supervisory circuits in a manner which will become apparent later. As the pointer 435 is attached to the shaft 410 it will be rotated until it stands opposite the 15 cent indication on the dial. By the operation of the pointer 435 the subscriber is informed that it is necessary for him to deposit 15 cents in the paystation. lVhen 5 cents is deposited in the coin chute the lever which would ordinarily be operated by the weight of the coin to actuate a bell in prior systems now operates the spring 440 once. In the same manner if a ten or twenty-five cent piece is deposited the spring 440 would be actuated twice in the first instance or five times in the second case. A Patent No. 1,106,090, issued to Seymour, discloses a method for operating a single pair of springs one or more times, depending on the coin desposited. Another Patent No. 1,137,399, issued to Goodrum, shows an alternative method of accomplishing the same result by causing one or a number of springs common to the same circuit to be operated, depending on the coin desposited. By the operation of the spring 440 the circuit of the magnet 410 is closed momentarily. Magnet 410 operates to open the circuit of the stepping magnet 413 at armature 412 and by the operation of armature 411 releases the ratchet wheel 423 one step. The descent of the coin also actuates the lever 441 where by the spring 418 is caused to engage its working contact and connect the coin c01- lecting magnet 419 to the line conductors 394 and 396 and to force the spring 420 away from its resting contact thereby disconnecting the stepping magnet 413 from the circuit. The slow acting relay 108 does not deenergize when the stepping magnet 413 is disconnected for the reason that the connection to ground through the resistance coil 434 is still in the circuit. The deposit 10 cents in the coin chute causes the spring 440 to be actuated twice whereby the escapement magnet 410 is operated twice to release the ratchet wheel 423 two steps. The cam on the shaft 416 now carts-es the spring 417 to be forced out of engage- .ment with its working contact to disconnect the resistance coil 434 from the previously traced simplex circuit. This operation opens the circuit of the slow acting relay 108 in the toll transmission repeater B. After a short interval relay 108 dcenergizes to open the circuit of the slow acting relay 103 at ari'nature 141, and to complete the circuit of the slow to operate relay 101 at armature 142. An additional result of the deenergization ofthe relay 103 is that at ar1natures 140 and 143 the talking circuit is prepared. The slow to operate relay 101 energizes over the above circuit and operates to establish a locking circuit for itself at armature 119, and at arn'iatures 118 and 120 opens the previously traced simplex circuit extending back through the relay 51 in the trunk circuit D. Relay 51, upon deenergizing, opens the locking circuit of the relay at arn'iature 57, at armature 56 removes the high resistance relay 49 from bridge of the trunk conductors, and at armature 58 disconnects the relay 52 from in series with the relay 50. Relay 54, upon deenergizing, at armature 02 opens the circuit of the lamp L whereby the operator is informed that the required amount has been deposited in the paystation apparatus at substation A, at arn'iatures 60 and 63 disconnects battery through the winding of relay 51 from the trunk conductors 90 and 91, and at the back contacts of these armatures completes a point in the talking connection. The removal of the rel: 52 from in series with the relay 50 causes tie relay 14 in the cord circuit O to energize. Upon operating, relay .14 completes the talking circuit by attracting the armatures 22 and 21.

Everything is now in readiness for the conversation to begin, at least so far as the connection to the subscriber at substation "r is concerned and ordinarily the operator will have extended the connection to the toll line terminating in the jack J. It will. be observed that the connection includes the two trunk conductor line from the toll station to the main exchange, the trunk comprising conductors 90 and 91. It should be noted that the called subscriber at substation A. controls the release of the connection while the receiver is removed through the medium of the battery feed relay 104 and slow acting relay 103. The latter controlling the local circuit of the line relay 160 of the first selector ll). This relay makes it possible for the toll operator to change cord circuits after the called party has answered without releasing the established connection.

When the conversation is terminated both subscribers will replace their receivers. Upon the replacement of the receiver at the substation A the battery feed relay 104 in the transmission repeater is dcenergized to open the circuit of the slow acting relay 103. The latter relay deenergizes to again connect the line relay 160 of the first selector 1E to the trunk conductors 90 and 91. As a result the polarized relay 15 in the operators cord circuit operates to attract its armature to close the circuit of the supervisory lamp L thereby giving the operator a disconnect signal. Before releasing the connection the operator will have to collect whatever coins were deposited and this operation will nowbe explained.

In order to collect the deposited coins the operator will throw the collect master key K and operate the ringing key 'K in the cord circuit 0. The keys K and K are common to all the cord circuits at the operators position and, when thrown, SGIVQIO connect leads from either of the high voltage batteries, B or B, to the, generator leads extending to the various ringing keys in the cord circuits. By the operation of the ringing key K the lead from the high voltage battery B is connected to the trunk conductor 90 from whence it flows through the upper left hand winding of the repeating coil in the transmission repeater, front contact and armature 131, through the winding of the high resistance relay 102 to ground by way of armature 125 and its back contact. The relay 102 is operated by the high voltage current from the battery 13 and, upon energizing, closes the circuit of the slow acting relay 107 at armature 121 and at armature 114 opens thelocking circuit of'relay 101. The purpose of the latter operation will be described hereinafter. Relay'107, upon energizing, completes a circuit for the upper winding of the line relay 160 of the first selector 1E in order to maintain this switch, the selector 2E and the connector H in their operated positions, connects the trunk condu'ctor90 direct to the trunk conductors 154 and 159 by way of armatures 135, 136, and 139, and

at the sametime connects the conductors 154 and 159 to ground by way of the resistance 95 and the condenser at armature 13?. Current now flows from the battery 13 through the low resistance relay 40, working contact of spring 31 and the-said spring, working contact and spring 26 and the said spring, ring of the plug- P,ri'ng. of

jack J, back contact and armature 60,-c0nture 228 and its front contact, wiper 200, bank contact 204-, trunk conductor 208,-

front contact and armature 335, armature 329 and its front contact, armature324 and its front contact, wiper -3 60, bank contact 390, line conductor 394,"and conductor 505, working contact and spring 418 and the said spring, and through the winding of the polarizedmagnet 419 to ground, and

the other branch extending byway of'front contact and armature 135, back contact and armature 144, conductor 154, armature 166 and its front contact, front contact andarmature 170, wiper 187, bank contact 191, armature 119 and. its front contact, wiper 197, bank contact 201, conductor 205, front contact and armature 338, armature 334 and its front-contact, armature 328 and its-front contact, wiper-163, bank contact 393', con- I ed coins, the paystation mechanismbeing re-set at the same, time. The armature 433 on the polarized magnetis immediately operated and serves to withdraw the ratchet wheel 423 by means of the shaft 416' from engagement with the escapement 411 and from the path of the actuating pawlj414. As theratchetwheel 423 is onestep away from normal, it releases to normal position.

WVhen the circuit through the polarized 'magnet419 is establishedthe resulting cur-' rent flow is sufficient to operate the low resistance relay 40in series with the battery lead from the battery B, and this relay, upon operating, closes the circuit of thesupervisory lam pv L thereby advising the operator that the collect circuits are operating and that the coins are being collected. The supervisory lamp L is common/to all the cord circuits of the position,and notifies the operator ofthe successful operation 'of the collecting or refunding circuits.

While it is true that the alternating current relay106 of the transmission repeater R will be momentarily energized due to the charging of the condenser 148, the momentary operation of the armature'134 will have no effect as the relay 107. operates at once and ground is removed from the front contact of armature134,

Having been informed by the operation of the" lamp L that the coin collecting apparatus at the subscribers paystation 'is functioning properly, the operator will restore Val in order to give the apparatus time to function properly and alsothe master collect control key K. V 1 If the toll operator desires to refund the deposited coins rather-than collect them she :the ringing key K to normal after an intermay do so by operating the master refund key K and then the ringingke-y K Assuming that the same conditions exist as in the previous case where the operator collected the coin, when the master refunding key K and the ringing key K is operated the battery lead from the battery B is connected to the trunk conductor 90. This high voltage battery is similar to the battery 13 but it supplies current of the opposite polarity and it follows therefore that the polarized magnet at the substation A will be operated in the opposite direction to refund the deposited coins rather than collect them. Except as pointed out, the refunding-operation is the same as the collecting operation and the operator is given supervision by means of the lamp L in the same manner as was hereinbefore described.

Under certain operations the tollopera'tor may find it desirable to collect or refund the coins deposited before she completes the connection. She may desire to refund the coins and re-set the paystation mechanism in case there is a dispute between herself and the subscriber as to the amount deposited. This operation will now be briefly described. If the subscriber does not deposit the required amount in the paystation mechanism, the escapement magnet 410 will not operate to completely restore the ratchet wheel 428 to allow the coil 434 to be disconnected from the simplex circuit. Consequently, the relay 108 in the transmission repeater R will remain energized and the lamp L in the trunk circuit D will remain lighted. The operator, noticingthe signal burning'an undue length of time, willl come in on the line by operating her listening key K? By this operation, inaddition to connecting head set to the trunk comprising conductors and 91, battery through the resistance 45 is connected by way'of working contact ofspring 46 and the said spring to the sleeve of the plug P whereby the marginal relay 52 in the trunk circuit D is energized Upon operating, relay 52at its armature 59 opens the locking circuit of the relay 54. Relay 54 deene'rgizes to open the simplex'circuit extending to the repeating relay 109 in the transmission repeater R and reestablish certain points in the talking connection. Relay 109 in the'repeater R deenergizesto open the simplex circuit extending to the paystation mechanism and completes the talking connection. The operator may now converse with the subscriberat substation A. If the subscriber maintains that he has deposited the proper amount in the coin box, the operator will operate the master refund key K and then the ringing key K .As the receiver is off the switchhook at substation A the battery feed relay 104 in the transmission repeater R will beenergi'zedand the high resistance relay 102 will be placed in bridge of the trunk conduetors'90 and 91. Now, when the=keys K 'and K are operated, the refunding operation takes place in the same manner as has been before described.

sired connection.

The operation of the polarized magnet 419 at the substation A also resets the ratchet wheel 423. The operator will now again set up on the toll assessing device the amount by operating the key K" and then the calling J device S to assess the required amount of toll in a manner similar to that already'described.

Should the operator have found upon coming in on the line that the subscriber at erating the calling device S and desire to release the mechanism. In order to do this, she will operate the master refund key K and then the ringing key K These operations bring about the energization of the high resistance relay 49 in bridge of the trunk conductors 90 and 91 in the trunk circuit D. Upon operating, relay 49 opens the simplex circuit extending to the transmission repeater R. Relay 109 therein de- -energizes to open the simplex circuits extendingto the substation A. The relay 54 in the trunk circuit D deenergizes and allows high voltage current to flow over the trunk conductors 9O and 91. The high resistance relay 102 in the transmission repeater now operates to project high voltage refunding current out to the substation A whereby the polarized magnet 419 is 0perated to release the toll assessing mechanism in a manner already described. To against set the toll'assessing device the operator momentarily operates the key K and proceeds in the same manner as before.

Attention is directed to the fact that each time a coin is deposited'the escapcment magnet 410 at substation A is operated to allow the ratchet wheel 423 to release one step. The POl11t-I4;35 is attached to the ratchet wheel and consequently at all times is opposite the amount the subscriber has yet to deposit before he is able to obtain the do- This of course tends to lessen the number of disputes that might otherwise arise.

The release of the main connection over the toll service trunk is brought about by the removal of the plug P from the. jack J. At least this is true if the called subscriber has replaced his receiver. In order to explain this operation more fully it will be assumed that the plug P is removed from 'the jack J "before the subscriber at substation A has hung up. By removal of the plug P from the jack J the circuit of the sleeve relay 50 is opened and this relay deenergizes to EHO "connect the high resistance relay 7 O in bridge of the conductors'90 and 91. The relay 71 does, not dener'gize at this time as its locking circuit remains intact. The busy lamp L is thus maintained lighted to indicate that the associated trunk hne is-busy. Now,

'When the called subscriberreplaces hisreceiver the relay 10 1 in the repeater R is deenergized and the line relay 160 of the toll first selector 1E is again connected to the trunk conductors 90 and 91," as wasex- "plained hereinbefore in connection with the control of the supervision. The effect of this is to-energize the relay in the trunk circuit D. Relay 70, upon energizing, a-tit's' V armature '72 opens'the locking circuit of'the relay 71. Upon retracting its; armatures, the latter relay opens the circuit of the busy lamp L and at its armature 73 remove's'the relay 70 from in bridgeof the trunk conductors and 91. 'The line relay 1600f the selector 1E now deenergizes to open the g deenergizin circuit of the associated slow acting relay 161' at armature 167, andat armature 166 opens the operating circuit extending to the connector H. The slow acting relay 161,

upon energizing, completes the circuitof the release magnet 183in multiple With the relay 164.- at armature 169, and zit-armature 168-removes ground from therelease trunk conductor 207 thereby allowing relay 303 in the connectorII to'deenergi'ze and also the switching relay 215 of the second selector 2E. Relay 164-111 the selector 1E is energized in multiple with therelease magnet 183 and operates to open a point in the circuit of the upper Windingof'the line relay 160 at armature 175, and atarmature 176 toopen a point in the locking circuit of the relay 165'so-asto prevent: relay 1 65 from energizing in case the'swit'ch wipers during the release should encounter any bank contact sets associated withtbusytrunk lines. At the connector H, the relay 303, upon opens the circuit of the-relay 302. The latter relay, upon retracting its armature 327, closes the circuitof the release magnet 309. In this manneiythe"connector H is restored to normal. As mentioned before, the retraction ofarmature 168 on the slow acting relay 161 in the'toll first se- 'lector 1E also opens the holding circuit of the switching relay 215 of the second se-' lector 2E.

The latter relaydeenergizes to restore this selector to normal by closing the circuit of the usual release-magnet. Upon the selector 1E- restoring-to normal, the .electro-polarized relay in the transmission repeater R which has been'maintained energized by ground through ofi normal spring 186 and its working contact, de-

energizes to restore certain circuits in the transmission repeater R. In thismanner all the apparatus used in the connectionis restored to its normal position. 4

ing circuit being effective immediately following the deenergization of the slowacting relay 308, and at armature 34:7 connects a lead from the busy signalling machine to the lower heavy talking conductor. Hai ing called the digits correspondingto the called subscribers number, the toll erator will restore her calling device key 4 to its normal position. As the supervisory lamp L" is not lighted at this time,- the'toll operator will come in on the line by actuatlng the listening key K 1n order to ascertain whether or not the desired line is busy. The 5 I busy tone which Was placed on the heavy talking conductor is now audible to the toll operator, and she will restoreher listening key to normal and busy herself with other connections while waiting for the desired line-to become idle. When the line of the substation A becomes idle, groundwill be rerelay 307 will be deenergized to remove the tone from the upper heavy talking conducto'r, and at the same time complete the. circuit of the relay- 303. This relay will operate to reverse the battery flow over the incoming trunk line. By the latter operation, the electro-polarized relay 105 in the repeater R is energized and operates in the'usual manner to establish a locking circuit foritself and to prepare a circuit for the battery feed relay 104; Another result of the energization of the relay 105 moved from the test contact 375 and the test is that battery is reversed over conductors Y 90' and 91 in the" usual manner and the polarized relay 15in the cord circuit 0 is operated to light the supervisorylamp L.

The lighting of the supervisory lamp notities the operator that the desired line has becomejidle. In theconnector H the relay 303 is energized and a metallic circuit projects back to the repeating coil in the trans- 'miss'ion repeater R. The operatorflatthe toll board noticing the operations-of the lamp L" will noW operate her ringing key and thesignalling current will be proscribed. When the called party responds, the batteryfeed relay'104: willbe energized over the called line loop and will operate to; disconnectthe line relay 160 from the trunk conductors 90 and 91. The latter operation causes the polarized relay 15' in 'jected out on the called line as before dc the opera'tors cord circuit to deenergi-ze to extinguish the supervisory lamp L .and notify the operator that the vconnect-ion .is completed. The subsequent operations in which the connection is finally completed, the coins collected or refunded, as the case may be, and the connection finally released, will take place in the same manner as was hereinbefore described.

The above is the normal operation of the connector H when engagement is made with the bank contact set associated with a. busy line if this line is a private line. However, should the lineofthe substation A be one of the group'oi' lines, the test contacts 391 and 392 thereof will be connected 'ina .manner shown in Fig. 6. Fig. 6 represents a level of bank contacts in which are terminated private lines and group lines, the lines of the group being the fourth, fifth, sixth, and-seventh bank contacts. These lllllBS .are all listed underone number in the directory and when connection is desired withoneof these lines the wipers of the connector H will be rotated into engagement with the set of bank contacts associated with the first set of bank contacts. If this line is busy and if there is an idle line in the group, the connector H will operate to automatically select and connect with it. However, if all the lines in the group are busy, the connector will remain with its wipers in engagement with the fourth-set of bank contacts, transmitting a busy signal to the callingtolloperator until one of the lines in the'group-becomes idle. Uponthis latter event, the connector will operate as previously mentioned. This operation of the connector H willinow be described a little more fully. For this purpose it will be assumedthat the line of the substation .A is the first one of a group of lines and is busy when-the connector wipers are rotated into engagement with the bank contact set comprising contacts 390-393, inclusive. As thereis a ground potentialpresent uponthe test contact 392 the test .relay 307 will be energizediin the usual manner. As the test contacts 302 and'39l are-connected together there will also be a ground potential upon the test contact 391. Following the deenergizationof the-slow acting relay 308, a circuit may bertraced extending from grounded test contact 391, wiper 361, armature 348 and its back contact,'back contact and armature337, armature 3t6- and its front contact, through the winding of the stepping relay 305, and through the winding of the slow actingrelay 306 to battery. Relays 305 and 306 are energized over the above circuit. Relay 3055, upon operating, at armature 339 establishes locking circuitfor itself, and at armature 3A0 completes the circuit of the-rotary.magnet.3l0. .Ma-gnet 310 operates to advance the wiperscof'the switch one step into engagement with the next set .neaeaor :of bank contacts, (and at armaturei337 opens the circuit of the stepping relay v305, which deenergizes opening-the circuit of the rotary magnet, which deenergizes also. The energizatio'n of the slow acting relay 306 serves merely to maintain the lead from the busy signalling machine disconnected from the upper heavy talking conductor during the automatic rotary movement ofthe connector. If the next line of the groupis busy tllGitGSt relay 30.7 will be maintained. energized and the stepping relay 305 will again operate to close the .circuit of the rotary magnet 310. Magnet 310 willoperateto-open the locking circuit ofthe stepping relay and toagain ad- .vance the wipers. The stepping relay 305 is deenergized to open .the .circuitof the rotary magnet, which deenergizes. The alternate operationof the stepping relay 305 and the rotary magnet 3:10 continues untilthe switch wipers are rotated into engagement with a set of bank contacts associated with an idle line. lVhen the switch wipers 360363, in elusive, are brought intoengagement with a setof bank contacts associated with an idle trunk line,there will be no circuit for the test relay 307, and this relay will deenergize and a circuit is thereby completed for the switching relay 303. The subsequent operations take place in a manner similar to that already described.

The relays 370 and37 3, inclusive, are associated with'the test contacts of the various lines of the group and are connected in multiple with the private normal conductors the associated relays will be energized and when all the lines offthe group are busy theconnection between the-test contacts associated with the firstrlineof the group will ,be opened andshould the switch wipers of the connector suchas ,H be rotated-into engagement with the first set of bank con tacts, under these.conditions, the connector would operate in the same manner as if engagement were made with the contactset associated with a busy private line. As soon as one of the lines in the group becomes idle the associatedrelay, such as the relay 373, will be deenergized and complete the connection betweenthe test contacts 374 and 375 whereby-the automatic rotary movement of the connector is initiated. The connector will then operate to select the idle-line in the usual manner.

It is the-usual practice in automatic tele- .pho-ne systems, totake the trunk lines which extend to private branch exchange from .bank contacts accessibleto rotary connector tor-desire to connect with a subscriber in a branch exchange, she-will operate her calling llfi device in accordance with the directory number of the private branch exchange in the usual manner. In response to the operations of the calling device, connection-will set up. in the same manner as was described hereinbefore, and it will be assumed that the switches 1E, 2E and H are the ones used in extending the connection to the private branch exchange trunk line. When the wip- Upon energizing, relay 105 reverses the connections of line relay 160 of the firstselector 1E with regard to the trunk conductors 90 and 91. This operation brings about the lighting of the supervisory lamp L in the operators cord circuit, thereby notifying the operator that the desired connection is completed. The foregoing operationstake place in a manner similar to, that before described. However, the trunk lines extending to the branch exchange are usually provided with a signal across the trunk. This being the case, the battery feed relay 104 in the repeater R will beimmediately energized over the connected trunk line and, upon operating, will close the circuit of the slow acting relay 103. The operation of the latter relay places an additional ground upon the-ringing control conductor 155 and completes-a local circuit for the line relay 160 of the first selector 1E. In addition the operation of the relay 103 serves to disconnect battery from the trunk conductors 90 and 91 and the bridged polarized relay 15 in the operators cord circuit is deenergized to extinguishthe erator that the called subscriber has ansupervisory lamp L". Ordinarily the eifacementof this signal serves to inform the opswered. However, the operator will remember that she has called a private branch exchange and she will operate the ringing key K. in her cord circuit in the same manner as if she were signalling a local party. The alternating current relay 106 in the repeater R operates as before to complete a circuit for relay 100. Relay'100, upon operating, at armature 115 removes one ground connection from the ringing control conductor 155, but this operation is ineffective to open the circuit of the ring cut off relay 104 in the connector H, as the ringing control conduc-' tor has been grounded bythe operation of the relay 103. A further result of the energization of relay 100 is that theright hand Winding of the repeating coil is disconnected from the trunk' conductors extending to the connector H at armature 115 and 117, and the, battery feed relay 1 04 would'be deenergized were it not for the fact that there is a local circuitcompleted for it which extends 7 from ground by way of front contact and armature 122, resistance 99, armature 11 6'and its front contact, lower righthand wlnding of the repeating coil, front contact and armature132 and through the lower winding of relay 104 to battery. .As the relays and 104 are now both operated, ringing cur rent from thegenerator'Gen. is connec'tedto the trunk line extending to the private branch exchange in order ,to operate the bridged ring down signal ,thereat. The subsequent operation wherein the connection is completed to thedesired called subscriber in the private branch exchange, the .conver sation completed, the coins collected or refunded, and the connection finally released, -will take place in the usual manner which need not be described.

It issometiines necessary for the toll oper ator, after the connection is completed, to: make anadditional charge, as the called automatic subscriber may" have conversed for a period of time longerthan he'has originally paid for. In order to describe the operation of this condition, it will he assumed that the subscriber at substation A is required to pay an additional amount for his connection. When the conversation is terminated, the operator receives the .usual disconnect signal by the lighting of the supervisory lamp Las a result of the called subscriber replacing his receiver. Theoperatorwill collect the coins already deposited at the substation A. To do this she will operatethe master collect key K and then the ringing key K ":This operation brings about the operation of the high resistance relay 102 in the repeater R whereby the coin collecting magnet 419 operates to collect the coins deposited and also resets the toll'assessing mechanisinincluding the ratchet wheel 423 and the pointers 435 and 486. The energizationof the high resistance relay 102 in the repeater R also opens the look ing circuit of the slow to operate relay 101. Relay 101, upon deener izing, closes certain points in thepreviously traced simplex circuit at armatures 118'and 120;. As it is necessary for the'subscriber at substation A to deposit more money in the coin box, the

cut ott relay 304 in the connector H and the signal mg device at substation A 18 automatically operated in the usual manner.

I/Vhen the subscriber responds by removing the operator will momentarily operate the key K as before. This operation brings about the energization of relay 54 which operates to establish the usual simplex circuits for controlling the stepping magnet 413 in the toll assessing mechanism at the paystation apparatus of the substation A. The subsequent operations wherein the coins are refunded or collected, and the connection finally released, take place in the usual manner.

The features of the invention having been described and ascertained what is considered to be new and desired to have protected by Letters Patent will be pointed out in the appended claims.

hat I claim is:

1. In a telephone system, telephone lines, means for establishing a connection between said lines, paystation mechanism on one line, and mechanism at the station of said line operative after the connection is completed to visually indicate to the subscriber thereat of the charge to be placed in said paystation mechanism to pay for the connection.

2. In a telephone system, a toll board, a telephone line, automatic switches controlled from the toll board to establish a. connection with said line, paystation mechanism at the station on said line, and means controlled from the toll board to operate said mechanism to notify the subscriber the amount of charge for an established toll connection.

3. In a telephone system, a local exchange equipped with a toll board, a distant exchange, trunk lines extending from said distant exchange terminating in said toll board, means including cord circuits at the toll board and automatic switches at the local exchange whereby toll lines and subscribers lines may be connected over said trunk lines, paystation equipment the stations on the subscribers lines, and means whereby the toll operator may visually indicate to the subscriber on the called line the amount to be deposited in said paystation equipment to pay for established toll connections.

4:. In a telephone system, a toll board, a telephone line, automatic switches controlled from the toll board to establish a connection With said line, paystation"mechanism at the station on said line, means controlled from the toll board to operate said mechanism to notify the subscriber the amount of charge for an established toll connection, and means operative when various amounts are deposited in the paystation mechanism for subtracting the amount deposited from the amount set up.

5. In .a telephone system, a toll board, a telephone line, automatic switches controlled from the toll board to establish a connection with said line, paystation mechanism at the station on said line, means controlled from the toll board to operate said mechanism to notify the subscriber the amount of charge for an established toll connection, means operative when a certain amount is deposited in the paystation mechanism for subtracting that amount from the amount set up, and means operative when another coin is deposited for subtracting its amount from the amount indicated so that at all times the amount set up is indicative of the amount still necessary to deposit to pay for the established connection.

6. In a telephone system, a toll board, a telephone line, automatic switches controlled from the toll board to establish a connection with said line, paystation mechanism at the station on said line, means controlled from the toll board to operate said mechanism to notify the subscriber the amount of charge for an established toll connection, and means operative as coins are deposited in the paystation mechanism for indicating to the subscriber the amount still to be deposited.

7. In a telephone system, two telephone lines, an operators position, means controlled :trom said position for connecting said two lines, paystation mechanism at the station on one of said lines, means for notitying the subscriber at said station of the amount necessary to deposit in said mechanism to pay for the connection, a visual signalat said position, and means for operating said signal when the correct amount is deposited in said paystation mechanism.

8. In a telephone system, two telephone lines, an oper'a-tors position, means controlled from said position for connecting said two lines, paystation mechanism at the station on one of said lines, operator controlled electro mechanical means for notifying the subscriber at said station of the amount necessary to deposit in said mechanism to pay for the connection, and means for preventingthe complete establishment of the connection until said amount is depo.sited.-

9. In a telephone system, two telephone lines, an operators position, means controlled from said position for connecting said two lines, paystation mechanism at the station on one of said lines, means for visually notifying the subscriber at said station of the amount necessary to deposit in said mechanism to payfor theconn'ection, means for preventing the complete establishment of the connection until said amount is deposited, and means for establishing the connec tion when said amountis deposited.

10. In a telephone system, two telephone lines, an operators position, means controlled from said position for connecting said lines, paystation mechanism at the station on one of said lines, means controlled from said position for operating said mechanism to indicate to the subscriber thereat the amount necessary to deposit to pay for the connection, a signal at said position, and means for operating said signal when the correct amount is deposited.

11. In a telephone system, two telephone lines, an operators position, means controlled from said position for extending a connection to each of said lines, operator controlled pay station mechanism for notifying one of the subscribers of the amount to be deposited to pay for the connection, and automatic means operative when said amount is deposited in said mechanism for connecting said two lines.

12. In a telephone system, a toll board, a telephone line, automatic switches controlled from the toll board to establish a connection with said line, paystation mechanism at the station on said line, and means including a simplex circuit connecting said mechanism with the toll board for permitting the o-per ator to operate said mechanism to indicate to the subscriber the amount of charge .for the connection. 7

13. In a telephone system, a toll board, a telephone line, automatic switches controlled from the toll board to establish aconnection with said line, paystation mechanism at the station on said line including a device for visually indicating to the subscriber the amount which must be deposited before the connection can be completed, and operator controlled means for setting said indicating mechanism. 7

14. In a telephone system, a toll board,.a telephone line, automatic switches controlled from the toll board to establish a connection with said line, paystation mechanism at'the station on said line including a device for visually indicating to the subscriber the amount which must be deposited before the connection can be completed, 0 erator controlled means for setting said indicating mechanism, and operator controlled means for restoring said device in case it has been improperly set.

15. In a telephone system, telephone lines, paystation equipment on each line, an operators position, means controlled by the operator for establishing connections requiring different charges and for setting the pay that line to deposit a certain plurality of coins to pay the charge for the connection.

16; In a telephone system, a line, meansv for establishing a connection therefrom, paystation mechanism on said line, means controlled over the established connection for setting the paystation to require the deposit of a certain amount therein to pay the charge for the connection, said mechanism controlled'by the deposit of only the required amount to complete the connection.

17. In a telephone system, telephone lines, paystation equipment on each line, an operators' position, means controlled by the operator for establishing connections requiring difierent charges and for setting the paystation mechanism on one of the lines connected together, to require the subscriber on that line to deposit a certain plurality of coins to pay the charge for the connection. I

18. In a telephone system, a line, means for establishing a connection therefrom, paystation mechanism on said line, means controlled over a circuit superimposed on the established connection for setting the paystation to require the deposit of a certain amount therein'to pay the charge for the connection, said mechanism. controlled by the deposit of onlythe required amount to complete the connection. 1

19. In a telephone-system, a line, paystation mechanism on the line, means for establishing connections of different value from the line, means in the mechanism operated a varying number of times over the established connection depending on the value of the connection, said last means restored by the deposit of coins of the proper amount or value to complete the established connection.

'20. In a telephone system, a line, paystation mechanism on the line, means for estab--- lishing a connection from said line, means controlled over said established connection for setting said paystation to require the deposit of a certain amount to pay for the tion for indicating the amount required, and

means for restoring the indicator and com pleting the established connection when the required amount has been deposited.

21. In a telephone system, a line, means.

for establishing a connection from said line, paystation mechanism on said line, means controlled over said'established connection for setting said paystation mechanism to visually indicate the amount required for the connection, and means for establishing a talking connection when the required amount has been deposited.

22. In a telephone system, a line, means for establishing a connection from said line, paystation mechanism on said line, means 

